qapi/types qapi/visit: Generate built-in stuff into separate files

Linking code from multiple separate QAPI schemata into the same
program is possible, but involves some weirdness around built-in
types:

* We generate code for built-in types into .c only with option
  --builtins.  The user is responsible for generating code for exactly
  one QAPI schema per program with --builtins.

* We generate code for built-in types into .h regardless of
  --builtins, but guarded by #ifndef QAPI_VISIT_BUILTIN.  Because all
  copies of this code are exactly the same, including any combination
  of these headers works.

Replace this contraption by something more conventional: generate code
for built-in types into their very own files: qapi-builtin-types.c,
qapi-builtin-visit.c, qapi-builtin-types.h, qapi-builtin-visit.h, but
only with --builtins.  Obey --output-dir, but ignore --prefix for
them.

Make qapi-types.h include qapi-builtin-types.h.  With multiple
schemata you now have multiple qapi-types.[ch], but only one
qapi-builtin-types.[ch].  Same for qapi-visit.[ch] and
qapi-builtin-visit.[ch].

Bonus: if all you need is built-in stuff, you can include a much
smaller header.  To be exploited shortly.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20180211093607.27351-21-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
[eblake: fix octal constant for python 3]
Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 9 insertions, 4 deletions

diff --git a/Makefile b/Makefile
index b9f320f6ba..494ae38279 100644
--- a/Makefile
+++ b/Makefile
@@ -90,10 +90,13 @@ endif
 include $(SRC_PATH)/rules.mak
 
 GENERATED_FILES = qemu-version.h config-host.h qemu-options.def
-GENERATED_FILES += qmp-commands.h qapi-types.h qapi-visit.h qapi-event.h
-GENERATED_FILES += qmp-commands.c qapi-types.c qapi-visit.c qapi-event.c
-GENERATED_FILES += qmp-introspect.h
-GENERATED_FILES += qmp-introspect.c
+GENERATED_FILES += qapi-builtin-types.h qapi-builtin-types.c
+GENERATED_FILES += qapi-types.h qapi-types.c
+GENERATED_FILES += qapi-builtin-visit.h qapi-builtin-visit.c
+GENERATED_FILES += qapi-visit.h qapi-visit.c
+GENERATED_FILES += qmp-commands.h qmp-commands.c
+GENERATED_FILES += qapi-event.h qapi-event.c
+GENERATED_FILES += qmp-introspect.c qmp-introspect.h
 GENERATED_FILES += qapi-doc.texi
 
 GENERATED_FILES += trace/generated-tcg-tracers.h
@@ -519,7 +522,9 @@ qapi-modules = $(SRC_PATH)/qapi-schema.json $(SRC_PATH)/qapi/common.json \
                $(SRC_PATH)/qapi/transaction.json \
                $(SRC_PATH)/qapi/ui.json
 
+qapi-builtin-types.c qapi-builtin-types.h \
 qapi-types.c qapi-types.h \
+qapi-builtin-visit.c qapi-builtin-visit.h \
 qapi-visit.c qapi-visit.h \
 qmp-commands.h qmp-commands.c \
 qapi-event.c qapi-event.h \